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Pair with any good quality SSD. I've used a bunch of Samsung ones and they've always been solid. But get the Pro versions.
Ram disk is too volatile. Don't even.
USB sticks, even though they might be USB3 are terrible for start up drives. They don't have the endurance, speed and internal management (controllers, cache, firmware et al) that a propper SSD has. SSDs are almost computers in their own right, dongles are just dumb storage with a common connector.
Bro. I'm getting over 400 MB/s read and write. It shits all over the 5400 rpm internal drive.
Can't run TRIM commands over USB though, so I'm relying on Samsung's internal garbage collection, which is perfectly fine.
There is more than one flavour of USB 3 though, so make sure if you do this, get one that is UASP, which queues data more effectively, giving you near SATA 3 speeds. Hopefully I'm not breaking some fundamental IT policy at work... I did at least encrypt it before cloning.
Oh, and I sprang for an 850 Pro, as its probably more reliable than most and has a 10 year warranty and a ridiculous endurance rating.